President-elect Donald Trump’s threat to impose 100% tariffs on BRICS nations if they create an alternative to the U.S. dollar has drawn mixed reactions from leading economists, highlighting tensions over global trade and currency dominance.

The president-elect’s threat to hit Canada, Mexico and China with new tariffs is already rocking business and diplomatic relationships and could topple the trade pacts he signed in his first term.

A spokesperson at the Chinese Embassy in Washington said his country is fighting fentanyl trafficking, the reason for the new promised penalty.